950xl ( obviously ) touch issues.

My phone has a really nasty habit of adding a shed load of characters when typing. It's taken me an age to get this bit done. I hit a key and then the keyboard just swiped random characters. It doesn't do it all the time. It happens on AU, and RS 2 insider and TH. It'll go days without it happening, then goes mental again. The screen is clean, unscratched and no protector.

I thought it was touch, but can't adjust that as no facility to do it found. I am guessing that this is going to have to go back, but due to the intermittent nature, it's difficult to replicate. Tried soft reset, OK for a while, then starts again. As I get to the end of this post it has stopped!

Any ideas? Can I turn swipe off and see if that changes it? If so, where is that hiding? I don't use it anyway.

The XL screen is so sensitive that you only have to hover over it and ita character is selected